The French police arrested a former member of the Italian Red Brigades who had escaped arrest for nearly three months.
Maurizio Di Marzio was the only one of ten suspects associated with a left-wing militant group who was not detained by authorities in April.
Seven terror suspects were detained in their French homes, and two others went to the police.
But Di Marzio, the tenth defendant, was arrested Monday morning in Paris, Italy’s justice ministry said.
He was sentenced to 15 years in prison for a series of violent crimes committed in Italy in the 1970s and 1980s.
This includes the attempted kidnapping of the deputy head of the DIGOS security police in Rome in January 1982.
The Red Brigades were especially active during Italy’s “years of leadership”, when the country was bloodied with repeated political acts of terror.
These people fled Italy after left-wing groups were inactive and sought refuge abroad before they could be imprisoned to serve their sentences.
The arrest of 10 former participants in France came after prolonged pressure from the Italian authorities. French President Emmanuel Macron said his administration wanted to address a problem that had long caused tensions with Rome.
In accordance with the so-called “Mitterrand Doctrine,” Paris allowed former leftist terrorists to remain in France and not extradite them to Italy as long as they promised to renounce violence.
Di Marzio has reportedly lived in France since the 1990s and his arrest warrant expired on May 10.
But a Roman court ruled that his alleged crimes did not expire at the expiration of the statute of limitations, and the warrant for his arrest is still in force.
Di Marzio has been remanded in custody and must appear before the Paris Court of Appeal to hear a decision on his extradition.